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Aluminum electrolytic cell overhaul dreg harmless treatment system and method

A technology of harmless treatment and aluminum electrolytic cell, applied in the direction of solid waste removal, etc., can solve the problems of low efficiency of harmless treatment of electrolytic aluminum overhaul slag, decrease of reaction rate, influence of reaction efficiency, etc., to facilitate continuous treatment , to avoid corrosion of equipment, to meet the effect of emission requirements

Active Publication Date: 2016-07-06
郑州鸿跃环保科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The process of slurry preparation, slurry leaching, cyanide removal and fluorine removal can only be carried out in the same reaction chamber, which is not conducive to continuous treatment. In order to improve the processing efficiency, the capacity of the reaction chamber can only be increased, while the treatment in a single reaction chamber Too much slurry may lead to uneven cyanide and fluorine removal reactions, a decrease in reaction rate, and a decrease in treatment efficiency. Therefore, the treatment device has a low efficiency in harmless treatment of electrolytic aluminum overhaul slag
Similarly, when the harmless process is in operation, the overhaul slag raw materials and cyanide removal agent are added and mixed at the same time. The slurry preparation, leaching slurry and cyanide removal process cannot be separated. The raw materials, reactants and products are all mixed together. Affect its reaction efficiency, also lead to its reaction is not thorough enough, reducing the treatment effect

Method used

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  • Aluminum electrolytic cell overhaul dreg harmless treatment system and method

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Effect test

Embodiment 1

[0055] The method for reclaiming calcium fluoride from aluminum electrolytic cell overhaul slag of the present embodiment comprises the following steps:

[0056] 1) The overhaul slag raw material is transported to the vibrating conveyor through the raw material conveyor belt, the iron in the raw material is removed through the iron removal device on the vibrating conveyor, and sent to the crusher by the vibrating conveyor for crushing, and the crushed raw material is screened , Small raw materials with a diameter of no more than 20mm are sent to the block silo through the elevator, and large raw materials with a diameter larger than 20mm are sent back to the crusher for further crushing; small raw materials in the block silo are sent to the ball mill through the electromagnetic vibrating feeder for further crushing. The raw material fine powder is made by ball milling, sieved, and the raw material fine powder after sifting out impurities such as aluminum lumps and iron lumps is...

Embodiment 2

[0063] The method for reclaiming calcium fluoride from aluminum electrolytic cell overhaul slag of the present embodiment comprises the following steps:

[0064] 1) The overhaul slag raw material is transported to the vibrating conveyor through the raw material conveyor belt, the iron in the raw material is removed through the iron removal device on the vibrating conveyor, and sent to the crusher by the vibrating conveyor for crushing, and the crushed raw material is screened , Small raw materials with a diameter of no more than 20mm are sent to the block silo through the elevator, and large raw materials with a diameter larger than 20mm are sent back to the crusher for further crushing; small raw materials in the block silo are sent to the ball mill through the electromagnetic vibrating feeder for further crushing. The raw material fine powder is made by ball milling, sieved, and the raw material fine powder after sifting out impurities such as aluminum lumps and iron lumps is...

Embodiment 3

[0071] The method for reclaiming calcium fluoride from aluminum electrolytic cell overhaul slag of the present embodiment comprises the following steps:

[0072] 1) The overhaul slag raw material is transported to the vibrating conveyor through the raw material conveyor belt, the iron in the raw material is removed through the iron removal device on the vibrating conveyor, and sent to the crusher by the vibrating conveyor for crushing, and the crushed raw material is screened , Small raw materials with a diameter of no more than 20mm are sent to the block silo through the elevator, and large raw materials with a diameter larger than 20mm are sent back to the crusher for further crushing; small raw materials in the block silo are sent to the ball mill through the electromagnetic vibrating feeder for further crushing. The raw material fine powder is made by ball milling, sieved, and the raw material fine powder after sifting out impurities such as aluminum lumps and iron lumps is...

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Abstract

The invention relates to an aluminum electrolytic cell overhaul dreg harmless treatment system and method and belongs to the technical field of electrolytic aluminum waste treatment. The aluminum electrolytic cell overhaul dreg harmless treatment system comprises a leaching bin used for leaching overhaul dregs and a reaction bin unit connected with the leaching bin and used for carrying out cyanogen removal and fluoride removal treatment. The aluminum electrolytic cell overhaul dreg harmless treatment system comprises the leaching bin and the reaction bin unit, slurry making and slurry leaching can be carried out in the leaching bin, and cyanogen removal and fluoride removal reactions are carried out in the reaction bin unit. The procedures are carried out separately. When one procedure is carried out, the other procedure is not affected and can be carried out simultaneously. Continuous cyanogen removal and fluoride removal treatment can be realized, and the treating efficiency is improved.

Description

technical field [0001] The invention relates to a harmless treatment system and treatment method for overhaul slag of an aluminum electrolytic cell, belonging to the technical field of electrolytic aluminum waste treatment. Background technique [0002] Aluminum electrolytic cell overhaul slag contains cathode carbon blocks, refractory bricks, paste, insulation bricks, refractory powder, refractory mortar, insulation boards, infiltrated metals and electrolytes, and a small amount of aluminum nitride and cyanide salts, the composition of which is by weight The percentage meter includes 33% carbonaceous materials, 30% fluorine-containing substances, 34% refractory insulation materials and a small amount of other substances, which are listed as hazardous waste because they contain soluble fluoride and a small amount of cyanide. The amount of overhaul slag produced in aluminum electrolytic cell increases with the output of electrolytic aluminum, so harmless treatment must be car...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 常醒王利杨见喜马瑞娜
Owner 郑州鸿跃环保科技有限公司
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